When I started, I used a wall to support me when I kicked up from the dolphin pose

Forearm strength, shoulder strength, and general flexibility can be developed by practising multiple rounds of SuryaNamaskaar

Andrei Ram Om's video on the Feathered Peacock pose (above) touches up on some subtle but important aspects about the back position (arched) and the differences between various hand positions. I think it's extremely relevant to know these differences when you start so that you can experience the full flavour of the pose